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Editorial Team
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Asked: 2026-05-23T14:38:10+00:00

I understand that all insert operations will come to commitlog first, and Memtable second,

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I understand that all insert operations will come to commitlog first, and Memtable second, after that it will be compacted to SSTable.

After compaction to SSTable, I perform an update operation for an existing column.
Must the SSTable be changed to update the value of that column?

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  1. Editorial Team

    http://wiki.apache.org/cassandra/MemtableSSTable says:

    Once flushed, SSTable files are immutable; no further writes may be done

    Your updated value will be written to commitlog, and a memtable, and will eventually be flushed to a new SSTable on-disk. Later, this SSTable may be merged with other SSTables to form a new larger SSTable (and the old ones will be discarded) – this is the compaction stage.

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